Oman retains crown as world's biggest gypsum exporter …
Exports of Omani gypsum – a key raw material for the cement and gypsum board manufacturing industries – amounted to 8.74 million tons in 2021. ... According to …
Application of lime neutralised phosphogypsum in supersulfated cement
The inevitably incorporation of P 2 O 5 impurity results in the poor quality of phosphogypsum (PG), which further hinders the utilisation of PG in manufacturing the supersulfated cement (SSC), an environment-friendly and energy-saving cement made almost entirely from industrial waste. Lime neutralisation provides a sustainable …
Omani gypsum exports rise in 2022
Oman: Producers and exporters despatched 9.9Mt of gypsum from Oman in 2022. The figure corresponds to year-on-year growth of 13% from 8.74Mt in 2021. ...
Incorporation of phosphogypsum with cement in rigid …
Most of the phosphogypsum used in the production of Fig. 2 came from the RSA Mart Kanpur in the Indian state of Uttar Pradesh. RSA Mart's Phosphogypsum is available in an off-white hue. Phosphogypsum (Phosphate of Gypsum) powder is white and has a specific gravity of 2.3 % to 2.6 %.
Effect of Modified Phosphogypsum on Properties of Cement …
The Industrial Waste (phosphogypsum) is a waste product which was produced from the chemical industries. This waste material is used in concrete.
THERMAL TREATMENT OF PHOSPHOGYPSUM AS A SET …
Phosphogypsum (PG), the by-product of phosphoric acid industry, comprises of calcium sulfate dihydrate, and other contaminants which restricts the industrial use of phosphogypsum in cement industry as a set retarder. Remedial thermal treatment of phosphogypsum as a set retarder for Portland cement production is investigated in …
On Pretreatment Experimental Study of Yunnan
This paper studied effect of different pretreatment process on Yunnan phosphorus building gypsum strength and crystal morphology such as washing method, lime neutralization method, flotation method and Hans method. A lots experiment result indicated that basic properties of phosphorus building gypsum of different pretreatment …
Oman becomes world's largest gypsum exporter
"That leaves Oman as the single most important source of high grade natural gypsum for cement and gypsum board manufacturers across Asia and …
Treated phosphogypsum as an alternative set regulator and …
DOI: 10.1016/j.jclepro.2019.118752 Corpus ID: 211459430; Treated phosphogypsum as an alternative set regulator and mineral addition in cement production @article{Rosales2020TreatedPA, title={Treated phosphogypsum as an alternative set regulator and mineral addition in cement production}, author={Julia Rosales and …
Utilization of solidified phosphogypsum as Portland cement retarder
The utilization of the phosphogypsum (PG) as cement retarder is both an economical and an ecological approach to treat this solid waste. Cement using raw PG as retarder has two problems pressing for solution,namely, delaying the setting time and difficulty being fed into the cement mill. The soluble phosphates in PG behave as super …
Phosphogypsum circular economy considerations: A critical …
Phosphogypsum (PG) is the primary byproduct generated during the production of phosphoric acid, an intermediate product in phosphate fertilizer production, from calcium phosphate (apatite) ore. PG also exists in very small amounts in nature where it is the result of natural guano processes as they took for instance place in the …
Microstructural and Phase Characteristics of Phosphogypsum-Cement
The effects of the tricalcium aluminate (C 3 A) content of the stabilizing cement [Type II (1.3% C 3 A) cement and Type III cement (9.3% C 3 A)], curing time (seven to 90 days), proportion of PG (5–60%), grain size, and impurities in phosphogypsum (PG) (PG compared to gypsum) on the microstructural (by scanning electron microscopy) and …
A systematic review of phosphogypsum recycling industry …
The development of phosphogypsum (PG) recycling industry plays an important role in promoting the environmentally friendly transition of the phosphorus chemical industry, worldwide.
UTILISATION OF PHOSPHOGYPSUM IN CEMENT MORTAR …
Abundant of research investigations have been conducted to utilized the waste or chemical gypsum, phosphogypsum for various applications. Most of the research investigations were carried out by purifying phosphogypsum for the impurities present in it and then its utilization were suggested. In another research approach phosphogypsum could be …
Phosphogypsum: Properties and Potential Use in Agriculture
Phosphogypsum (PG) is a calcium sulphate dihydrate and a by-product of the phosphate fertilizer industry. It is produced in huge quantities (300 MT/year), but only 15% of the PG produced is recycled. ... Characterization and purification of waste phosphogypsum to make it suitable for use in the plaster and the cement industry. Chem Eng Commun ...
Resource utilization and development of phosphogypsum …
1. Introduction. Phosphogypsum (PG) is a bulk industrial solid waste of wet-process phosphoric acid production. Every ton of phosphoric acid production …
Preparation and Micromechanics of Red Sandstone–Phosphogypsum–Cement
Based on the physical and chemical properties of red sandstone (RS), RS is used to produce composite cementitious materials. The flowability, mechanical strength, and micromechanics of a red sandstone–cement binary cementitious material (RS-OPC) were investigated as functions of the amount of RS replacing the cement (OPC). …
Comprehensive Utilization of Phosphogypsum and …
Phosphogypsum is a by-product of phosphoric acid industrial production, and its stacking volume is increasing year by year, which brings a great threat to the environment and agricultural safety. The way of comprehensive utilization of phosphogypsum was described, and the mechanism of phosphogypsum producing cement, preparing …
Effect of Phosphogypsum on the Properties of Portland Cement
This may be due to the formation of anhydrate at early stage [21]. The processed sample gave 10% addition as optimum for both initial and final setting time (comparable with control sample). Fig. 2. Setting time of cement clinker and phosphogypsum (field condition) Fig. 3. Setting time of cement clinker and …
Preparation of gypsum with high purity and whiteness from phosphogypsum …
Cai, Q. et al. Efficient removal of phosphate impurities in waste phosphogypsum for the production of cement. Sci. Total Environ. 780, 146600 (2021).
Feasibility analysis for decomposition of phosphogypsum in cement …
In recent years, many scholars had put forward a new idea in which the New Suspension Preheater Cement Production Technique (or NSP) would be used to decompose phosphogypsum to produce vil and ce...
Research on the Performance of Phosphorus Building …
16.2.1 Experimental Raw Materials. Phosphogypsum: Phosphogypsum from a chemical plant in Yunnan, the analyt-ical results are shown in Table 16.1. Cement: Yunnan …
Research on the Performance of Phosphorus Building …
1. Phosphogypsum: Phosphogypsum from a chemical plant in Yunnan, the analyt-ical results are shown in Table 16.1. 2. Cement: Yunnan Huaxin PC425 cement, standard curing 7d compressive strength of 30.8 MPa, standard curing 28d compressive strength of 46.5 MPa, burn loss of 23%. Table 16.1
Valorization of phosphogypsum in cement-based materials…
Phosphogypsum(PG) is one of the typical bulk industrial solid wastes generated in the phosphate chemical industry. Due to its huge production volume and immature resource treatment technology, a large amount of PG can only be stored and disposed in slag yards, and its impact on the ecological environment is becoming …
Effective and innovative procedures to use phosphogypsum …
Phosphogypsum (PG) waste is a by-product generated from wet-process phosphoric acid (H3PO4) manufacturing during phosphate rock decomposition. Worldwide, the annual production of PG ranges between 100 and 300 million tons, with only a few quantities utilized in several application domains (about 15%), the unused PG is usually …
Use of an industrial by-product phosphogypsum in the production …
Dihydrate phosphogypsum (PG) is the main by-product of the production of fertilizers in SC Lifosa (Lithuania). The specific gravity of phosphogypsum is 2360 kg/m 3, its average pH value is 3.1.The XRD pattern of this material (Fig. 1, curve a) confirms that the dominant compound is dihydrate gypsum CaSO 4 ⋅2H 2 O (d – 0.763, 0.428, 0.306, …
Characterization and purification of waste phosphogypsum to …
The phosphoric acid production in Morocco generates a large amount of phosphogypsum (PG) which is a significant source of environmental contamination. In this work, PG has been characterized by different analysis techniques that allow to study the effect of the impurities on its physical and chemical properties.
Phosphogypsum: potential uses and problems – …
Phosphogypsum could be used as a substitute of natural gypsum in the production of Portland cement to control the hydration reaction rate of cement. In this study, raw phosphogypsum was …
Coatings | Free Full-Text | Factors Affecting the …
Phosphogypsum (PG) is a kind of industrial solid waste residue that is generated during the wet production of phosphoric acid. The main mineral composition of PG is CaSO 4 ·2H 2 O, and it is …